單項(xiàng)選擇題DC generators are classified according to the manner in which（）

A.they are used
B.the field windings are connected to the load
C.the armature circuit is connected to the load
D.the field windings are connected to the armature circuit


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1.單項(xiàng)選擇題A circuit that has one wire in contact with the hull of the ship is a（）

A.series circuit
B.grounded circuit
C.short circuit
D.closed circuit

2.單項(xiàng)選擇題If two AC generators are to be operated in parallel, the load is distributed evenly by（）

A.means of rheostat the governor settings
B.a balance coil excitation
C.adjusting the governor settings
D.changing excitation

3.單項(xiàng)選擇題If a voltmeter is connected across a line, it must be protected with a（）

A.shunt
B.high-resistance coil in the armature circuit
C.low-resistance coil in the armature circuit
D.shunt and a coil of high resistance

4.單項(xiàng)選擇題When current and voltage reach maximum values at the same time, the power factor is（）

A.minimum
B.maximum
C.leading
D.lagging

5.單項(xiàng)選擇題Which is an acceptable means of correcting high mica between commutator bars?（）

A.undercutting
B.sanding
C.burnishing
D.filing